/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.sql.execution

import java.util.concurrent.atomic.AtomicReference

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.catalyst.TableIdentifier

import scala.collection.mutable.ArrayBuffer

/**
  * Created by allwefantasy on 11/9/2018.
  */
object MLSQLAuthParser {
  val parser = new AtomicReference[WowSparkSqlParser]()

  def filterTables(sql: String, session: SparkSession) = {
    val t = ArrayBuffer[WowTableIdentifier]()
    lazy val parserInstance = new WowSparkSqlParser(session.sqlContext.conf)
    parser.compareAndSet(null, parserInstance)
    parser.get().tables(sql, t)
    t
  }
}
